ZZ gamma and Z gamma gamma couplings at linear e(+)e(-) collider energies with the effects of Z polarization and initial state radiation
PHYSICAL REVIEW D, vol.70, no.5, 2004 (SCI-Expanded)
- Publication Type: Article / Article
- Volume: 70 Issue: 5
- Publication Date: 2004
- Doi Number: 10.1103/physrevd.70.053014
- Journal Name: PHYSICAL REVIEW D
- Journal Indexes: Science Citation Index Expanded (SCI-EXPANDED)
- Open Archive Collection: AVESIS Open Access Collection
- Ankara University Affiliated: No
Abstract
The constraints on the neutral gauge boson couplings, ZZgamma and Zgammagamma, are investigated at linear e(+)e(-) collider energies through the Zgamma production with longitudinal and transverse polarization states of the final Z boson. Because of high energy of linear electron-positron beams, initial state radiation (ISR) considerably changes the production cross section. We obtain an increase in the cross section by a factor of 2-3 due to ISR for transverse polarization and by a factor of 10-100 for longitudinal polarization states depending on the energy. We find the 95% C.L. limits on the CP conserving form factors h(3)(Z), h(4)(Z), h(3)(gamma), and h(4)(gamma) with integrated luminosity 500 fb(-1) and roots=0.5,1,1.5 TeV energies. It is shown that the longitudinal polarization of the Z boson, together with ISR, can improve sensitivities by factors 2-3.